Meitantei Conan S2013E12 - The Evening Cherry Blossom Viewing Route on Sumida River (Part 1)

Kogoro assists the police delivering ransom money to the Nihonbashi Post Office. When arriving at the post office, Kogoro is given a briefcase with further instructions. After Kogoro falls off a boat and gets sick, Conan and Ran begin investigating, but soon...they stumble upon a body!